\begin{tabular}{l*{11}{c}}
\hline
                 &\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}&\multicolumn{1}{c}{Yr}\\         &\multicolumn{1}{c}{4}&\multicolumn{1}{c}{5}&\multicolumn{1}{c}{6}&\multicolumn{1}{c}{7}&\multicolumn{1}{c}{8}&\multicolumn{1}{c}{9}&\multicolumn{1}{c}{10}&\multicolumn{1}{c}{11}&\multicolumn{1}{c}{12}&\multicolumn{1}{c}{13}&\multicolumn{1}{c}{14}\\ \hline  \emph{Second stage}\\
Enrollment  &       0.108** &       0.131   &       0.089   &       0.044   &       0.069   &       0.112   &       0.176   &       0.246   &       0.282   &       0.377   &       0.425   \\
            &     (0.054)   &     (0.096)   &     (0.139)   &     (0.184)   &     (0.218)   &     (0.252)   &     (0.288)   &     (0.324)   &     (0.362)   &     (0.397)   &     (0.428)   \\
\hline
Controls    &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   &         Yes   \\
F-stat      &         241   &         241   &         241   &         241   &         241   &         241   &         241   &         241   &         241   &         241   &         241   \\
N           &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   &        3784   \\
Mean of Y   &        0.62   &        1.28   &        1.93   &        2.55   &        3.16   &        3.77   &        4.37   &        4.96   &        5.56   &        6.16   &        6.76   \\
\hline
\end{tabular}
